The naming conventions in the Outer Tracker system are based
on the scheme illustrated in the LHCb note
In that note was established a convention for the addressing
of the FE electronics, summarized in the figure below, and
essentially based on a geographical subdivision of the OT system
3 stations: T1, T2, T3;
4 layers: L0 (X), L1 (U), L2 (V), L3 (X);
4 quarters: Q0, Q1, Q2, Q3.
The main point of the convention established in the
is that it is geographical: one does not refer to
a given module (resp. a FE Box) by an incremental number from 1 through 216
(resp. from 1 through 432); rather this is identified by
in what station (T1/T2/T3) ?
in what layer (L0/L1/L2/L3) ?
in what quarter (Q0/Q1/Q2/Q3) ?
If one looks
from an infrastructural point of view, the main detector units are the so called
(a detailed description
can be found at the section on the
OT Station Design).
The figure below is a top view showing
a schematic overview of the OT C-Frames on the two sides
(conventionally called "A" and "C")
of the beam line. In the figure are indicated explicitly the
corresponding station, layers, and quadrants of each C-Frame.
From the station, layers and quadrants of each C-Frame indicated in the
figure above becomes quite obvious the following naming convention established
for the C-frames:
In this naming convention,
"Q02" (resp. "Q13")
indicates that the C-Frame in on the
"C" (resp. "A")
side of the beam line, and
"XU" (resp. "VX")
indicates that the C-Frame contains
the module layers
"L0" and "L1"
(resp. "L2" and "L3").